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<p>Brazil, one of the largest producers and exporters of instant coffee, faces challenges in waste management, particularly due to the highly polluting wastewater generated. This study evaluated soluble coffee wastewater (SCWW) as a cultivation medium for laccase production by the fungus Pleurotus ostreatus and its application in degrading phenolic compounds in the effluent. Laccase production was monitored over 18&#xa0;days at 28&#xa0;°C using two media: a synthetic medium and one containing SCWW with a COD of 1000&#xa0;mg L<sup>−1</sup>. Results showed SCWW promoted a 22.3% increase in laccase activity compared to the synthetic medium and enabled degradation of pollutants. The enzyme had an optimal temperature of 40&#xa0;°C, an ideal pH of 6.0, and high stability across broad temperature and pH ranges. Additionally, the enzymatic extract degraded 32.3% of phenolic compounds in SCWW without chemical mediators. These findings highlight SCWW’s dual potential as a low-cost substrate for enzyme production and as a target for fungal biocatalytic degradation. This offers a promising, sustainable strategy, especially considering the limitations of conventional biological methods inhibited by SCWW’s toxicity.</p> Graphical Abstract <p></p>

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Valorization of Soluble Coffee Wastewater for Laccase Synthesis and Phenolic Compound Oxidation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月25日

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  • Fabricio Soares Moreira,
  • Marco Antonio Silva,
  • Giovana Tommaso,
  • Glauciane Danusa Coelho

摘要

Brazil, one of the largest producers and exporters of instant coffee, faces challenges in waste management, particularly due to the highly polluting wastewater generated. This study evaluated soluble coffee wastewater (SCWW) as a cultivation medium for laccase production by the fungus Pleurotus ostreatus and its application in degrading phenolic compounds in the effluent. Laccase production was monitored over 18 days at 28 °C using two media: a synthetic medium and one containing SCWW with a COD of 1000 mg L−1. Results showed SCWW promoted a 22.3% increase in laccase activity compared to the synthetic medium and enabled degradation of pollutants. The enzyme had an optimal temperature of 40 °C, an ideal pH of 6.0, and high stability across broad temperature and pH ranges. Additionally, the enzymatic extract degraded 32.3% of phenolic compounds in SCWW without chemical mediators. These findings highlight SCWW’s dual potential as a low-cost substrate for enzyme production and as a target for fungal biocatalytic degradation. This offers a promising, sustainable strategy, especially considering the limitations of conventional biological methods inhibited by SCWW’s toxicity.

Graphical Abstract